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DescriptionAquatic ferns or found in swamps. Rhizome short, erect. Stipe thick, green, succulent. Fronds tufted, strongly dimorphic; fertile fronds larger, more dissected, bearing narrower linear segments than the sterile fronds; sterile fronds often proliferous. Veins anastomosing, without included veinlets. Sporangia sessile, borne along the veins beneath the reflexed lamina margin functioning as an indusium.